https://www.youtube.com/channel/UCNVKQS-Jl70TYCmsEPO73QA/videos Seems pretty new, haven't watched all this his stuff, but I like what I've seen so far. Seems to know what he's doing and does his best to make the videos informative. He's a mechanic, not a film producer, so the technical aspects of the videos probably aren't the greatest, but they seem worth watching to me.
He's not adjusting Cummins 444 injectors-valves correctly
U-tube poster can read a service manual This video explaining adjusting injectors using 'base circle' method (Cummins' field engineer Fritz Engels started teaching base circle method early 70s 73-74). Base Circle method was used with non-top stop injectors by measuring injector plunger travel; required dial indicator. Manually rocking injector rocker 3~6 times to squeeze all diesel fuel out of the cone-sack (injector plunger taper-to-cup tapered surfaces)...ditto when adjusting with old torque method. Adjusting correctly extends camshaft and cam roller life